.back_out {
  -webkit-animation: puff-out-center 1.5s cubic-bezier(0.165, 0.840, 0.440, 1.000) both;
  animation: puff-out-center 1.5s cubic-bezier(0.165, 0.840, 0.440, 1.000) both;
}

@-webkit-keyframes puff-out-center {
  0% {
    -webkit-transform: scale(1);
    transform: scale(1);
    -webkit-filter: blur(0px);
    filter: blur(0px);
    opacity: 1;
  }
  100% {
    -webkit-transform: scale(2);
    transform: scale(2);
    -webkit-filter: blur(4px);
    filter: blur(4px);
    opacity: 0;
  }
}

@keyframes puff-out-center {
  0% {
    -webkit-transform: scale(1);
    transform: scale(1);
    -webkit-filter: blur(0px);
    filter: blur(0px);
    opacity: 1;
  }
  100% {
    -webkit-transform: scale(2);
    transform: scale(2);
    -webkit-filter: blur(4px);
    filter: blur(4px);
    opacity: 0;
  }
}
// 过渡
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to /* .fade-leave-active below version 2.1.8 */ {
  opacity: 0;
}
